HMAC Based One Time Passwords in PHP. RFC4226 and RFC6238 compliant.

HOTP/TOTP one time passwords on java phones (J2ME)

HOTP and TOTP algorithms in Erlang.

Nextcloud app that allows you to manage your OTP (TOTP/HOTP) codes easily

Nextcloud app that allows you to manage your OTP (TOTP/HOTP) codes easily

Go library for one-time passwords, supports HOPT and TOPT (Google Authenticator compatible)

Similar to the Google authenticator just written in Python to automate annoying two factor authentication.

A simple, easy-to-use one-time password generator implementation for .NET Core 3.1. Compatible with Google Authenticator.

A serverless web application that generates TOTP and HOTP codes, enabling robust two-factor authentication (2FA) directly within your browser. Powered by Nuxt 3, NuxtHub, Cloudflare Pages, D1 Database, and Drizzle ORM.

Cross-platform console C#/.Net implementation to generate one time passwords (TOTP/HOTP) for open authentication defined by standard RFC's (4226, 6238). Compatible with Google/Microsoft Authenticator apps.

A Swift library that provides cryptographic authentication algorithms like OCRA, HOTP etc.

HMAC-based one-time password generator. https://www.nuget.org/packages/sim756.HOTP

Kotlin Multiplatform library for OTP and TOTP password generation/validation

Implementation of HOTP and TOTP as per the RFC RFC4226 and RFC6238 respectively

Authenticator app with Python.

I tried to create my own HOTP generator and confirmatory with .NET 6.

Generate password for any site, with only a master password, a site name, a login and a counter using Lesspass algorithm. Generate TOTP or HOTP too.